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use strict;                     # Purpose: In each benchmark invocatio
+n, have one
use warnings;                   # (constant) string copied to another-
+ which is then 
...
  );
  print '- ' x 30, "\n"
}

string length: 20
                Rate reversestr substr_lhs regexsubst substr_rhs
...
regexsubst 197394/s      1102%        65%         --        -3%
substr_lhs 202514/s      1133%        69%         3%         --
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -